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EVALUATION
KIT
AVAILABLE
TC7662B
CHARGE PUMP DC-TO-DC VOLTAGE CONVERTER
FEATURES
GENERAL DESCRIPTION
■ Wide Operating Voltage Range: 1.5V to 15V
■ Boost Pin (Pin 1) for Higher Switching Frequency
■ High Power Efficiency is 96%
■ Easy to Use – Requires Only 2 External Non-Critical
Passive Components
The TC7662B is a pin-compatible upgrade to the Indus-
try standard TC7660 charge pump voltage converter. It
converts a +1.5V to +15V input to a corresponding – 1.5 to
– 15V output using only two low-cost capacitors, eliminating
inductors and their associated cost, size and EMI.
The on-board oscillator operates at a nominal fre-
quency of 10kHz. Frequency is increased to 35kHz when
pin1isconnectedtoV+, allowingtheuseofsmallerexternal
capacitors.Operationbelow10kHz(forlowersupplycurrent
applications) is also possible by connecting an external
capacitor from OSC to ground (with pin 1 open).
■ Improved Direct Replacement for Industry Stan-
dard ICL7660 and Other Second Source Devices
APPLICATIONS
■ Simple Conversion of +5V to ±5V Supplies
■ Voltage Multiplication VOUT = ±nVIN
■ Negative Supplies for Data Acquisition Systems
and Instrumentation
■ RS232 Power Supplies
■ Supply Splitter, VOUT = ±VS/2
The TC7662B is available in both 8-pin DIP and 8-pin
small outline (SO) packages in commercial and extended
temperature ranges.
ORDERING INFORMATION
Temperature
Part No.
Package
Range
PIN CONFIGURATION (DIP and SOIC)
TC7662BCOA
TC7662BCPA
TC7662BEOA
TC7662BEPA
TC7660EV
8-Pin SOIC
0°C to +70°C
0°C to +70°C
+
+
V
8-Pin Plastic DIP
8-Pin SOIC
BOOST
1
2
3
4
8
7
6
5
BOOST
1
2
3
4
8
7
6
5
V
+
+
CAP
GND
CAP
GND
OSC
OSC
– 40°C to +85°C
– 40°C to +85°C
LOW
VOLTAGE (LV)
LOW
VOLTAGE (LV)
TC7662BCPA
TC7662BEPA
TC7662BCOA
TC7662BEOA
8-Pin Plastic DIP
–
–
V
V
CAP
CAP
OUT
OUT
Evaluation Kit for
Charge Pump Family
FUNCTIONAL BLOCK DIAGRAM
+
+
V
CAP
2
8
1
BOOST
VOLTAGE–
7
6
RC
OSCILLATOR
4
÷ 2
–
LEVEL
OSC
LV
CAP
TRANSLATOR
5
V
OUT
INTERNAL
VOLTAGE
REGULATOR
LOGIC
NETWORK
TC7662B
3
GND
TC7662B-8 9/11/96
TELCOM SEMICONDUCTOR, INC.
4-83